The 1999 Audi A8 is available as a 4-door, 5-seat sedan. Starting at $57,400, the 1999 Audi A8 FWD is powered by a 3.7L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 26-mpg on the highway. The top of the line 1999AudiA8AWD , priced at $ 65,000 , is powered by a 4.2L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 25-mpg on the highway.